Interview with Advanced Laser Imaging, London, UK

ALI use laser imaging technology to assist law enforcement agencies with their investigations. Could you tell us more about this service?

It’s basically using laser scanning within all sorts of contexts. The London bombings was probably one of the first main jobs it was used on, as well as the Princess Diana inquest, and similar cases. Probably most murders that you see now in London have been laser scanned and captured in this way.

A lot of it you don’t actually see in the final product because we’ve got to go with whatever’s simplest for a jury to understand. Three years ago, we were laser scanning everything, but you weren’t seeing anything in court. What’s happened since then is we’ve started to realise that jurors need to see things in three dimensions, because it’s the best way that they can understand the world…

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Despite timestamps being ubiquitous, the understanding of their exact meaning is mostly overlooked in favor of fully-automated, correlation-based approaches. Existing work for practitioners aims at understanding Windows and is not directly applicable to Unix-like systems.

In this paper, we review how each layer of the software stack (kernel, file system, libraries, application) influences MACB timestamps on Unix systems such as Linux, OpenBSD, FreeBSD and macOS.

We examine how POSIX specifies the timestamp behavior and propose a framework for automatically profiling OS kernels, user mode libraries and applications, including compliance checks against POSIX.

Our implementation covers four different operating systems, the GIO and Qt library, as well as several user mode applications and is released as open-source.

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YouTube Video UCQajlJPesqmyWJDN52AZI4Q_i0zd7HtluzY

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